| Thalestris graminiformis Rizzini, 1952 |
| Thunbergia Retz., 1780 |
| Thunbergia alata Bojer ex Sims, 1825 |
| Thunbergia erecta (Benth.) T. Anderson, 1864 |
| Thunbergia fragrans Roxb., 1796 |
| Thunbergia grandiflora Roxb., 1820 |
| Thunbergia laurifolia Lindl., 1856 |
| Thunbergia mysorensis (Wight) T. Anderson, 1867 |
| Thunbergioideae T. Anderson, 1860 |
| Thyrsacanthus Nees, 1847 |
| Thyrsacanthus Moric., 1847 |
| Thyrsacanthus callistachyus (Schltdl. & Cham.) Nees, 1847 |
| Thyrsacanthus foliaceo-bracteatus Oerst., 1855 |
| Trichantherinae Benth. & Hook. f., 1876 |
| Trybliocalyx Lindau, 1904 |
| Trybliocalyx albicaulis (Brandegee) D.N. Gibson, 1970 |
| Tubiflora J.F. Gmel., 1791 |
| Tubiflora acuminata Small, 1903 |
| Tubiflora squamosa (Jacq.) Kuntze, 1891 |
| Yeatesia Small, 1896 |